Toothbrush



FIG. 1 is a perspective view of a toothbrush showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is an enlarged left view thereof;

FIG. 4 is an enlarged right view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is another perspective view thereof. 

The ornamental design for a toothbrush, as shown. 